Seperate glX from HAVE_OPENGL, for platforms that have both an X server and a more official way to do OpenGL, explicitly check for glX on Mac OS X, and use SDL_LoadObject for platforms that have glX but don't have dlopen().

Makefile.in
Makefile
.libs
*.o
*.lo
*.la
SDL_systhread.c
SDL_systhread_c.h
SDL_syssem.c
SDL_syssem_c.h
SDL_sysmutex.c
SDL_sysmutex_c.h
SDL_syscond.c
SDL_syscond_c.h
clone.S